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## Index: U

union metacharacter, lack of: 3.2.9. Alternative Operations
union of regular expressions: 3.2. A Line-Up of Characters
  3.2.9. Alternative Operations
uppercase (see capitalization)
user-defined functions: 9.3. Writing Your Own Functions
UUCP: 0.. UUCP
uutot.awk script (example): 13.1. uutot.awk—Report UUCP Statistics

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